Suppression of ψ(2S) production in p-Pb collisions at √sNN = 5.02 TeV

Abelev, B. and Planinić, Mirko and Simatović, Goran and Zyzak, M. (ALICE Collaboration) (2014) Suppression of ψ(2S) production in p-Pb collisions at √sNN = 5.02 TeV. Journal of High Energy Physics, 2014 (12). pp. 73-24. ISSN 1029-8479

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The ALICE Collaboration has studied the inclusive production of the charmonium state ψ(2S) in proton-lead (p-Pb)collisions at the nucleon-nucleon centre of mass energy √sNN = 5.02TeV at the CERN LHC. The measurement was performed at forward (2.03 < ycms < 3.53) and backward (−4.46 < ycms < −2.96) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections σ (2S), both integrated and as a function of the transverse momentum pT, for the two ycms domains. The results are compared to those obtained for the 1S vector state (J/ψ), by showing the ratios between the production cross sections, as well as the double ratios [σ (2S)/σJ/ ]pPb/[σ (2S)/σJ/ ]pp between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive ψ(2S) is evaluated and compared to the measurement of the same quantity for J/ψ and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the ψ(2S) compared to that measured for J/ψ and to models. These observations represent a clear indication for sizeable final state effects on ψ(2S) production.

Item Type: Article
Keywords: relativistic heavy ion physics, heavy Ions, charm physics
Date: December 2014
Subjects: NATURAL SCIENCES > Physics
Additional Information: © 2015 The Authors. This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited. Published for SISSA by Springer. Article funded by SCOAP3. Revised: October 14, 2014. Accepted: November 17, 2014. Published: December 10, 2014.
Divisions: Faculty of Science > Department of Physics
Project code: 119-0982887-1006, 098-0982887-2878
Publisher: Springer
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 30 Apr 2015 18:45
Last Modified: 29 May 2016 19:45

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